Surface-Modified Quantum Dots for High-Loading Inkjet Curable Compositions
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Solution Overview
Problem
Quantum dots are difficult to incorporate into polar systems like binders or curable monomers due to hydrophobic surface characteristics, limiting photoefficiency and processability, and solvent-based compositions face issues with nozzle clogging and viscosity, hindering their application in actual processes.
Innovation Solution
Surface-modify quantum dots with a compound having a passivation effect, such as those represented by Chemical Formula 1, and use them in solvent-free or solvent-based curable compositions with specific polymerizable monomers and additives to enhance dispersibility and photoefficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum dots are dispersed in solvent-based curable composition, then photoefficiency can be improved, but viscosity increases beyond ink-jetting capability and nozzle clogging occurs
Solution Approach 1:
The patent changes the chemical parameters of the quantum dot surface by applying specific surface treatments (silane coupling agent treatment, oxide layer formation) to modify surface energy and polarity. This enables quantum dots to be dispersed in polar solvent-free curable compositions at high concentrations (30-60 wt%) without excessive viscosity increase, making the composition suitable for ink-jetting while maintaining high photoefficiency
Solution Approach 2:
The patent creates a composite system by combining quantum dots with polymerizable monomers and oligomers in a solvent-free curable composition. The quantum dots are surface-modified with coupling agents that facilitate strong interfacial bonding with the polymer matrix, creating a composite material that achieves both high photoefficiency and processability
2Reliability
If quantum dot content is increased to improve photoefficiency, then absorption rate increases, but viscosity exceeds ink-jetting range
Solution Approach 1:
The patent modifies the surface parameters of quantum dots through chemical treatment (silane coupling, oxide layer formation) to enhance compatibility with the polymerizable composition. This surface modification reduces aggregation and enables high quantum dot content (30-60 wt%) to be achieved without causing viscosity to exceed ink-jetting limits
Solution Approach 2:
The patent introduces surface coupling agents (silane-based compounds) as intermediaries between quantum dots and the polymerizable monomers. These coupling agents form a bridging layer that improves dispersion and reduces viscosity, enabling high quantum dot content while maintaining ink-jetting processability
3Ease of manufacture
If solvent content is increased to reduce viscosity for ink-jetting, then processability improves, but nozzle drying and clogging worsen
Solution Approach 1:
The patent extracts and eliminates the solvent component from the curable composition, developing a solvent-free system. This removes the source of nozzle drying and clogging problems while maintaining appropriate viscosity through optimized quantum dot surface treatment and composition formulation, enabling reliable ink-jetting processability
Solution Approach 2:
The patent changes the fundamental parameter of the composition from solvent-based to solvent-free by modifying quantum dot surface properties. This parameter change eliminates solvent-related harmful effects (nozzle drying, clogging) while maintaining processability through controlled viscosity via surface treatment and composition design
4Device complexity
If quantum dots are not surface-modified, then simplicity is maintained, but dispersibility in polar systems and photoefficiency are limited
Solution Approach 1:
The patent changes the surface chemical parameters of quantum dots through controlled surface treatments (silane coupling agent application, oxide layer formation). These parameter changes dramatically improve dispersibility in polar solvent-free curable compositions and enhance photoefficiency, justifying the additional processing steps
Solution Approach 2:
The patent creates a composite surface structure on quantum dots by forming oxide layers and applying silane coupling agents. This composite surface structure provides both improved dispersibility in polar systems and enhanced photoefficiency, while the systematic approach integrates smoothly into the manufacturing process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The surface-modified quantum dots improve photoefficiency, storage stability, and heat resistance, enabling high-concentration dispersion and effective application in both solvent-free and solvent-based curable compositions, addressing processability and viscosity issues.
Implementation Method 1
a quantum dot surface-modified with a compound having an improved passivation effect and thus exhibits improved photoefficiency
Implementation Method 2
a curable composition including the same, a cured layer using the composition
Data Source
AI summary
Disclosed are a surface-modified quantum dot, a curable composition including the quantum dot, a cured layer, and a color filter.